Abstract
The nodulation restrictive genotype of soybeans [Glycine max (L.) Merr.] rj1 rj1 is nodulated by some strains of Rhizobium japonicum. Inoculation with mixed cultures of rj1‐compatible and rj1‐incompatible strains has shown that the presence of an rj1‐compatible strain facilitates nodulation of rj1rj1 plants by an rj1‐incompatible strain. This study was undertaken to determine whether rj1‐compatible strains of R. japonicum produce a diffusable product capable of endowing rj1‐incompatible strains with the ability to nodulate the rj1rj1 genotype. An rj1‐incompatible strain remained unchanged in ability to nodulate rj1rj1 plants when: (a) grown in culture filtrates of rj1‐compatible strains, (b) cultured in U‐tubes across a 0.08 mμ pore size polycarbonate membrane from rj1‐compatible strains, or (c) cultured in dialysis tubing suspended in broth cultures of an rj1‐compatible strain. It was concluded that the rj1‐compatible strains tested apparently do not produce a diffusable compound in vitro capable of endowing rj1‐incompatible strains with the ability to nodulate the rj1rj1 genotype. The rj1‐compatible Rhizobium appear to exert their effect, in close proximity to the nodulation site.
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